The rubber seat on the armature of the solenoids can swell causing the normally open inlet solenoid to restrict or block the trailer service brake control air pressure passage.

Consequence Summary

Restriction causes reduced trailer service brakingaction. blockage causes complete loss of trailer service braking action. thereis no warning of the deterioration of the trailer service brakes, which canresult in loss of vehicle control and an accident.

Corrective Summary

Dealers will replace the mc-12 solenoids.

Notes

System: brakes; control assembly.equipment description: mc-12 modulator controller assembly.note: if the vehicle is presented to an authorized dealer on an agreed uponservice date and the remedy is not provided free of charge within a reasonabletime or the remedy does not correct the defect, please contact allied signal at1-216-329-9000. also, contact the national highway traffic safetyadministration's auto safety hotline at 1-800-424-9393.

Bulletins

Bulletin

Bulletin date

Replacement Bulletin

Item no.

Summary

Added

SERVICE BRAKES, AIR

SD-13-47672

10/01/2011

10042885

Bendix: information being provided for the trailer service brake module controller and the installation of the tabs-6 adv mc module on the heavy duty semi-trailers. *pe

01/23/2012

SERVICE BRAKES, AIR - ANTILOCK

SD-13-47672

10/01/2011

10042885

Bendix: information being provided for the trailer service brake module controller and the installation of the tabs-6 adv mc module on the heavy duty semi-trailers. *pe